How to get allowedVersions functionality in a regex manager?

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In https://github.com/rvolosatovs/docker-protobuf/blob/main/deps.list I want to simultaneously support two major versions of a dependency. Renovate should update PROTOC_GEN_GRPC_SWIFT_VERSION with v1.x.x releases, and PROTOC_GEN_GRPC_SWIFT_2_VERSION with v2.x.x releases from https://github.com/grpc/grpc-swift-protobuf

I naively tried to configure this as follows:

{
  "customManagers": [
    {
      "customType": "regex",
      "managerFilePatterns": ["^deps\\.list$"],
      "matchStrings": ["PROTOC_GEN_GRPC_SWIFT_VERSION=(?<currentValue>.*?)\\n"],
      "depNameTemplate": "grpc/grpc-swift-protobuf",
      "datasourceTemplate": "github-releases",
      "allowedVersions": "/^1\\./"
    },
    {
      "customType": "regex",
      "managerFilePatterns": ["^deps\\.list$"],
      "matchStrings": ["PROTOC_GEN_GRPC_SWIFT_2_VERSION=(?<currentValue>.*?)\\n"],
      "depNameTemplate": "grpc/grpc-swift-protobuf",
      "datasourceTemplate": "github-releases",
      "allowedVersions": "/^2\\./"
    },
  ...
  ]
}

This generates the error:

Error type: The renovate configuration file contains some invalid settings
Message: Custom Manager contains disallowed fields: allowedVersions

Is there some trick I can do with the named group in the matchStrings regex to achieve this functionality? Thanks for any help!

Logs (if relevant)

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[rarkins]

Needs to be inside packageRules

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Thanks, after some messing around I found that adding a section like this after customManagers will likely fix the issue:

  "packageRules": [
    {
      "matchDatasources": ["github-releases"],
      "matchPackageNames": ["grpc/grpc-swift-protobuf"],
      "matchFileNames": ["deps.list"],
      "matchStrings": ["PROTOC_GEN_GRPC_SWIFT_VERSION="],
      "allowedVersions": "/^1\\./"
    },
    {
      "matchDatasources": ["github-releases"],
      "matchPackageNames": ["grpc/grpc-swift-protobuf"],
      "matchFileNames": ["deps.list"],
      "matchStrings": ["PROTOC_GEN_GRPC_SWIFT_2_VERSION="],
      "allowedVersions": "/^2\\./"
    }
  ]

Hope this example helps someone!